Evaluation of thermomechanical behavior in controlled atmospheres of silicon carbide obtained from sawdust residues of the Peruvian timber industry

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Bringas-Rodriguez, V. C.
Huaman-Mamani, F. A.
Paredes-Paz, J. J.
Gamarra-Delgado, J. F.
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Elsevier BV
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The possibility of using biomass as a precursor of silicon carbide (SiC) has been studied for many years. In this research, reaction-formed silicon carbide was synthesized from sawdust residues of Peruvian wood. Residues were packed into cylindrical solid pieces through hot pressing and they were subsequently pyrolyzed in an inert atmosphere and infiltrated with metallic silicon in a vacuum atmosphere. SiC pieces were obtained with silicon remaining in their pores, so a chemical attack was performed to clean the samples. Mechanical and thermomechanical properties were evaluated in different environments to know the behavior of SiC through compression tests. The highest values were obtained at room temperature under normal conditions, a maximum stress of 686 MPa was achieved. In all cases, the samples had a fragile behavior as expected. In thermomechanical tests it was observed that resistance decreased according to the gradual rise in temperature. Finally, tests at 500 degrees C in oxidizing, inert and reducing atmospheres showed that the SiC maintained its maximum compression stress within the range of thermomechanical tests under normal conditions, which means that this material was not sensitive to chemical changes, being stable in all tests. At present, this work continues as research on thermomechanical behavior at temperatures above 1100 degrees C in different atmospheres. (C) 2020 Elsevier Ltd. All rights reserved.
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controlled atmospheres of silicon